This study develops a novel fiber Bragg grating (FBG) pressure sensor encapsulated with the smart
metal structure. The smart metal structure sensor made of welding the FBG plating a gold coat and the
nickel tube together using Au-Ge solder is introduced, and the FBG is mounted on a planar diaphragm
to enhance the pressure sensitivity. The diaphragm can be pressurized along one axial direction, and
responds to an axial force only. The FBG sensor pressure sensitivity is derived theoretically and
validated experimentally. The measured pressure sensitivity of the shift in the Bragg wavelength of our
experimental sensor is about 1.68&times;10<sup>-4</sup>MPa<sup>-1</sup>, which is approximately 85 times higher than that can be
achieved with a bare FBG. The pressure measurement precision of 0.5% over a full measurement range
of 20 MPa has been achieved. The linearity of our sensor is also good, and there is almost no hysteresis
effect. The temperature compensation performance of the pressure sensor is also studied.

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Journal of Applied Remote SensingJournal of Astronomical Telescopes Instruments and SystemsJournal of Biomedical OpticsJournal of Electronic ImagingJournal of Medical ImagingJournal of Micro/Nanolithography, MEMS, and MOEMSJournal of NanophotonicsJournal of Photonics for EnergyNeurophotonicsOptical EngineeringSPIE Reviews